diff --git a/server-tools/bingshuo-tcs-controller/controller-engine.mjs b/server-tools/bingshuo-tcs-controller/controller-engine.mjs
index 8f61709..fd2e9ca 100644
--- a/server-tools/bingshuo-tcs-controller/controller-engine.mjs
+++ b/server-tools/bingshuo-tcs-controller/controller-engine.mjs
@@ -43,6 +43,17 @@ function sourceFingerprint() {
   return hash.digest("hex").slice(0, 16);
 }
 
+function orientationInstruction() {
+  return [
+    "只依据当前事件形成TCS事件语义、当前目的和一个或多个允许的signal，不得按原文关键词扫描协议。",
+    "只输出一个JSON对象，且必须精确包含schema,cycle_id,event_sha256,instance_id,event_semantics,current_purpose,signals。",
+    "schema必须等于guanghu.zhuyuan-tcs-event-orientation/v1。",
+    "cycle_id,event_sha256,instance_id必须原样复制runtime_input中的同名值。",
+    "signals必须是非空对象数组；每一项必须包含字符串id和字符串why，id只能从runtime_input.orientation_contract.allowed_signals中选择。",
+    "不要把signals写成字符串数组，不要省略schema。",
+  ].join("\n");
+}
+
 function runRuntime(command, args) {
   const result = spawnSync(process.execPath, [runtimePath, command, ...args], {
     encoding: "utf8",
@@ -196,8 +207,7 @@ export class ControllerEngine {
     ]);
     const oriented = await this.generateValidated({
       role: "tcs_event_orientation",
-      instruction:
-        "只依据当前事件形成TCS事件语义、当前目的和一个或多个允许的signal_id。不得按原文关键词扫描协议。",
+      instruction: orientationInstruction(),
       input: {
         ...perceived.cycle.model_input,
         cycle_id: perceived.cycle.cycle_id,
diff --git a/server-tools/bingshuo-tcs-controller/controller-engine.test.mjs b/server-tools/bingshuo-tcs-controller/controller-engine.test.mjs
index ce9722f..3777296 100644
--- a/server-tools/bingshuo-tcs-controller/controller-engine.test.mjs
+++ b/server-tools/bingshuo-tcs-controller/controller-engine.test.mjs
@@ -172,6 +172,33 @@ test("resident engine completes a model-backed brain and controller cycle", asyn
   assert.equal(receipt.completed_cycles, 1);
 });
 
+test("orientation prompt carries the exact runtime contract required by the validator", async () => {
+  const stateRoot = fs.mkdtempSync(path.join(os.tmpdir(), "bs-tcs-contract-"));
+  const fixture = new FixtureModelClient();
+  let observedInstruction = "";
+  const modelClient = {
+    async generate(request) {
+      if (request.role === "tcs_event_orientation") {
+        observedInstruction = request.instruction;
+      }
+      return fixture.generate(request);
+    },
+  };
+  const engine = new ControllerEngine({
+    stateRoot,
+    modelClient,
+    modelName: "fixture-model",
+  });
+  engine.initialize();
+  await engine.runEvent(bootEvent());
+  assert.match(
+    observedInstruction,
+    /schema必须等于guanghu\.zhuyuan-tcs-event-orientation\/v1/,
+  );
+  assert.match(observedInstruction, /每一项必须包含字符串id和字符串why/);
+  assert.match(observedInstruction, /不要把signals写成字符串数组/);
+});
+
 test("an interrupted technical cycle is preserved and restarted in a new state epoch", () => {
   const stateRoot = fs.mkdtempSync(path.join(os.tmpdir(), "bs-tcs-recovery-"));
   const first = new ControllerEngine({